/* Copyright  2009
   @Author
   Richard Changde Yin            e-mail yinchangde@hotmail.com

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; version 2 of the License.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA */
   
/**
 * @filename:  function/unsigned.cc
 */ 
#include <server_includes.h>
#include CSTDINT_H
#include <function/unsigned.h>
#include <current_session.h>
#include <error.h>



void Item_func_unsigned::print(String *str, enum_query_type query_type)
{
  str->append(STRING_WITH_LEN("cast("));
  args[0]->print(str, query_type);
  str->append(STRING_WITH_LEN(" as unsigned)"));

}

int64_t Item_func_unsigned::val_int()
{
  int64_t value;
  int error;

  if (args[0]->cast_to_int_type() == DECIMAL_RESULT)
  {
    my_decimal tmp, *dec= args[0]->val_decimal(&tmp);
    if (!(null_value= args[0]->null_value))
      my_decimal2int(E_DEC_FATAL_ERROR, dec, 1, &value);
    else
      value= 0;
    return value;
  }
  else if (args[0]->cast_to_int_type() != STRING_RESULT ||
           args[0]->result_as_int64_t())
  {
    value= args[0]->val_int();
    null_value= args[0]->null_value;
    return value;
  }

  value= val_int_from_str(&error);
  if (error < 0)
    push_warning(current_session, COLLAPSAR_ERROR::WARN_LEVEL_WARN, 
                  ER_UNKNOWN_ERROR,
                 "Cast to unsigned converted negative integer to it's "
                 "positive complement");
  return value;
}


